Improved rock-drilling machine



fig/f.

PHOTO-LITMOGHAPHER. WASHINGYON. D Cv N. PETERS.

t tant @tijd -Mwwww- SAIVIUEL GABL'E, QF MILLERSTOWN, PENNSYLVANIA.Letters Patent' No. 87,162, dated February 23, 1869;

IMPROVED RCK-DRILLING MACHINE.

Thev Schedule referred to in these Letters Patent and making part of thesame.

To all whom it mag) concern:

Be it known that I, SAMUEL GABLn, otlvlillerstown, in the countyofPerry, and State of Pennsylvania, have invented new an d usefulImprovements in Rock-Drilling Machines; and I do hereby declare that thefollowing is afull, clear,and exact description thereof, which willenablethose skilled in the art to make and use the same,

reference being had to the accompanying drawings,form- Vented fromturning, and the fron-t end oi' the guideplate kept in the properposition with reference to the cam-rollers by which the drill is lifted.

In the drawings- A A are two uprights, connected by cross-braces B B,and

C C are the cross-pieces, and

D, the uprights of a rectangular frame, sliding Within the general frameA B, as shown.v

The uprights D are formed with tongues, l, which slide freely ingrooves, g, in the proximate faces ofthe uprights A, as shown, thusaffording the means of guiding the frame Ci D.

The drill-stock M slides freely in the irons P, which latter containfriction-rollers, d, and are atiixed to the cross-pieces C ofthe slidingframe.

N is the drill7 and is aliixed, by means of a socket and set-screw, tothe drill-stock.-

The drill passes through a horizontal plate of metal, G; andtheratchet-disk It, 011 the drill-stock, is within the bent plate j, whichlatter passes over the said disk, each end being ailixed to the plate G.

The drill-stock 'passes through this bent plate also.

A curved spring, J, exerts its tension on the top of the plate f, andserves to actuate the drill downward with force at each stroke.

This `spring is aliixed, as shown, to the upper crosspiece of thesliding frame, and its free end impinges on the plate f, just over thestud n, projecting downward from the said plate f, as shown.

a is a pawl, pivoted to the sliding frame, and actuated by a spring, b,to' bear its free end down upon the ratchet-toothed face of the disk It,sothat, at each upward movement of the drill-stock, the disk will becarried around one or more teeth, thus causing the edge of 'the drill tobe presented at a different angle from the preceding stroke.

Thespring also prevents the drill from rebounding, thus obtaining a moreeffective stroke, or dead-stroke.

e is a pawl and its spring, which serves to prevent the disk fromrotating backward.

The weightof the drill-stock and drill is sustained on two or morestuds, 'm m, projecting upward from the plate G, in contact with thelower face of the disk, as shown. f

nis the upper` stud, or hardy, sol called, which transmits the i'orce ofthe spring J to the drill-stock, through the disk R.

The drill is liited by means o f a double cam, consisting of tworollers, It h., the reduced ends of which are afforded bearings in thearm-plates K, mounted on the crank-shaft L, one end of whichlatterterminates in a hand-crank, Q.

This shaft L is aiforded `bearings in the arms lE, which pass throughmortises in the uprights D of the sliding frame, and are held iirnily insaid mortises by means of keys or wedges t.

The rear projections oi' these arms E afford attachment i'or thecross-plate I, from which rises the slotted guide-plate H, for steadyingplateG, the rear end of this latter plate being recessed, to t inthe'slot, and be guided by the same.

The sliding frame is adjustable up or down, according to the depth ofthe hole made by the drill, and is held at any one of several positionsby means of a notched plat-e,r T, pivoted to the upper cross-piece C,whereby any one ofthe notches of the said plate may be caught on thestud t, projecting from the nppe cross-brace B.

j is a stop, to hold up the pawl a Vwhen it is desired that the drillshall not rotate.

Then the crank Q is turned, the rollers (l successively encounter theprojecting end ofthe plate G, thus raising the drill-stock in itsguides, and allowing the same to fall as the rollers pass from contactwith it.

'Ihe lower ends of the uprights A are provided -with iron points, inorder to givev the machine .a suitable foothold on the rock or ground;and

S is along iron braceor shore, pivoted to the upper part of the frame AB, which acts .in conjunction with the said iron points, in holding theframe A B in 'the proper upright position. g

Ihe free end of this shore S rests' on the ground.

rIhe above isa general description of a rock-drilling machine embracingmy invention, which consists in combining the slotted guide-plate H withthe plate G and sliding frame 0 D, for the purpose of providing a simplemeans for holding the plate G from turning during the operation of thedrill, and, at the same time, keeping` its front end in the properrelation to the cani-rollers hI h.

I claim as new, and desire to secure by Letters Patent- The slottedguide-plate H, in combination with the plate G and sliding trame C D ofa rock-drilling machine, substantially as and for the purpose hereinshown' and described.

SAMUEL GABLE.

IVitnesses WILLIAM. STAHL, 'Hanni' Sownns.

